Triple eyelid folds with a fourth pre-fold? i'm only 21. (Photos)

While it is mild, it is caused by central disinsertion of the levator aponeurosis. This is the tendon that inserts into the eyelid that allows a muscle above the eyelid to open the eyelid. The upper eyelid crease is caused by skin insertions of connective tissue from the levator to the skin.  You are also missing volume in the upper eyelid.  The disinserted elevator aponeurosis takes a certain amount of fat into the orbit.  This causes your upper eyelid folds to look depleted.  Rather than filling this up with fillers, the right surgery will make this better.  It is essential to get the right surgery to repair this.  Routine belpharoplasty is absolutely the wrong surgery.  You need your upper eyelid fold.  If it is removed with blepharoplasty, you will look unsatisfactorily older and skeletonize. You need ptosis surgery and reconstruction of the upper eyelid fold.  This surgery is all about structure rather than removal of tissue.  This includes an anterior ptosis repair, and reconstruction of the upper eyelid crease which will support the upper eyelid lashes.  The effect of this surgery will be to open your eyes and make them more jewel like.

The extra skin folds in your upper eyelids has to do with A) relatively extra skin, and B) hollow upper eyelids. You may benefit from combination of upper eyelid skin removal and volume addition (either fat or filler). See an oculoplastic specialist.

you have some extra upper lid skin which is necessary to allow the upper lids to close. you also have an epicanthal fold where the upper eyelid blends into the lid margin as it approaches the medial canthus  (where the uppers meet the lowers near the nose).  as you have beautiful eyes and eyelids I would highly reccommend that you do nothing at this time as you are so young.  What you have ( as I see it ) a striking variation of normal which I see as a positive asset.  If this is not the way you see it, I would research out and look for the most experienced and reputable ophthalmic plastic surgeon in your area for an consultation.  this is usually an ophthamologist with additional fellowship training in plastic surgery of the eyelids.  caution there are a lot of hungry surgeons out there who would reccommend a procedure.